201144622 、發明說明： 【發明所屬之技術領域】 本發明係關於用於固定木材（例如鋪裝厚板）至底層木材托 梁或其他結構）之一種自攻螺絲。 【先前技術】 通常，當固定木材鋪裝厚板至底層木材結構時，做法為預先 鑽削該木材厚板然後使用一種習知自攻木材螺絲（諸如17型號 螺絲）以將木材鋪裝厚板固定至底層結構。若該木材鋪裝厚板 不經預先鑽削，則將一種習知自攻木材螺絲之直接應用於該厚 板，尤其係當該螺絲接近該木材之邊緣時，可導致該厚板於固 定點裂開，該螺絲越接近邊緣，裂開之趨勢增加。裂開可引起 安全問題且若裂開發生則通常需要更換該鋪裝厚板。 【發明内容】 本發明在其較佳實施例中提供一種自攻木材螺絲，其可應用 於接近該鋪裝厚板（或其他木材）之邊緣而無預先鑽削以避免 裂開之需要。 根據本發明，提供用於固定木材至一底層木材或金屬支架之 一種螺絲，該螺絲包含：一柄，其具有一鑽削部分於--端及一 頭部於另一端，該鑽削部分具有帶刀刃及自該刀刃延伸之一凹 槽區域之一鑽削尖端，以及一螺紋，其自該鑽削部分遠離該鑽 削尖端之端延伸至與該頭部隔開之位置，藉此該螺絲柄在該螺 201144622 紋之端與該頭部之間具有一無螺紋部分，其中在該螺絲應用期 間操作該鑽削部分以鑽削一孔，該孔具有比該螺絲柄之無螺紋 部分之直徑大的直徑，藉此當應用該螺絲穿過將被固定之木材 時，穿過該木材形成用於該無螺紋螺絲柄部分之一穿通孔。 在本發明之一較佳實施例中，該螺紋尖端直徑至少在其長度 之一實質部分為恆定的，且該直徑比該鑽削部分之直徑大至少 約 0.75 mm。 【實施方式】 本發明之較佳實施例之螺絲具有一鑽削部分2,其與設計用 於金屬之自攻螺絲之鑽削部分形狀相似，即具有兩個傾斜並徑 向相對之刀刃4，該刀刃4界定該鑽削尖端，該尖端通向沿該 鑽削部分之長度延伸之徑向相對之凹槽6。該螺絲之螺紋自鑽 削部分2遠離刀刃4之端延伸至向中心遠離螺絲頭8之位置， 以便在該螺紋之端與該螺絲頭之間留下螺絲柄之無螺紋部分 10。該螺紋形狀提供在該螺紋長度之實質部分恆定的螺紋尖端 直徑，雖然應瞭解於該螺紋之外端（其鄰近鑽削部分2之端） 處該螺紋在至少一個及可能兩個螺紋圈數後自零逐漸上升至全 螺紋高度。 在所示之實施例中，螺絲頭8為一埋頭（countersunk head)， 該埋頭於其下側具有齒8a以於該木材之表面切開一錐坑，該頭 部具有用於容納驅動鑽之内部驅動器。實際上，無螺紋部分10 之長度加上頭部8之深度會對應於該將被固定木材之厚度，就 201144622 舖板而言，該木材通常以一標準厚度（或標準厚度範圍）生產。 該較佳貫施例之螺絲之一特徵為鑽削部分2之有效直徑比該 螺絲柄之無螺紋部分10之有效直徑大，以便在應用該螺絲時， 鑽削部分2穿過該將被固定木材鑽削供無螺紋柄部分1〇之一穿 通孔，g S亥螺絲已完全應用時，無螺紋柄部分1 〇延伸穿過該穿 通孔。此仿效當預先鑽木材鋪裝厚板時提供一穿通孔用於標準 自攻木螺絲之推薦做法。實際上，根據本發明之較佳實施例， 木螺絲可能係以自8線徑至14線徑之尺寸之方式生產，且視該 螺絲之實際雜而定’鑽㈣分2之直徑超出該無螺紋柄部分 10有0.25 mm至1.5 mm。設想大多數生產用於固定木材鋪裝厚 板之螺絲為10線徑螺絲，且對於該等螺絲，鑽削部分2之直徑 超出無螺紋柄部分1〇之直徑約〇 6 mm至〇 7 mm。由第2圖可 知，當以與第1圖之視圖成90。觀察該鑽削部分時，換言之，自 側面」觀察時，該螺絲具有相對於在一種習知自攻金屬螺絲 之鑽削部分上可見之深度的—減少的深度。該減少的深度由在 產生超大鑽削部分2 (就其有效鑽削直徑而言）之形成過程期 間材料於圓柱狀金屬絲坯料内移位引起的。 因超大鑽’分2亦於底層木結構_削用以驅動該螺絲之 超大孔’故該螺紋必須具有足夠與該周圍木材恰好嚙合之直 L，其意謂著該螺絲具有稍微比相同線徑之一種習知螺絲之螺 紋尖端直徑大的雜尖端直徑。該賴鋪由在軋製過程中材 料於金屬絲坯料中移位造成的，且對於一給定線徑之螺絲存在 關於可自該金屬絲坯料移位以形成該螺紋之材料之數量的一固 有限制。在該較佳實施例中，藉由減小該螺紋之腹角至一夾角 201144622 ^來=現螺紋尖端直徑之增大，該夾W為15。至45。（較佳約 ）#目對於在—習知螺絲中-般為60。的夾角。透過此減 小=腹角的結果’使得增加了用於提供所需的加大的螺紋尖端 '的材料。在尺寸圍（本發明之該較佳實施例之螺絲可能 以該尺寸製造（8線徑至14線徑））之内，該螺紋尖端直徑超 出鑽削。P刀2之直徑至少約〇 75麵，更典型地超出約^ _ 至1.4mm。由於對用於形成該螺紋之材料之位移的實際限制， 〔度損壞螺距或螺紋根厚度的情況下，該螺紋尖端直徑在 上述線徑範圍之内未必可超出該鑽削部分之直徑多於約2.0麵 至2.5_。在具有16τρι (每英寸圈數）之⑺線徑螺絲之實例 中，該較佳實施例之螺絲之螺紋尖端直徑約為5 8 mm至6 〇 贿’然而在相同線徑之一種習知螺絲中螺紋尖端直徑約為4.65 mm 至 4.8 mm。 在所示之實施例中，該螺絲之頭部為一埋頭，在該埋頭下側 具有齒以便在該木材鋪裝厚板之表面切—錐坑凹σ而應瞭 解’本發明之廣義範如之螺料局限制於m定木材鋪板之 螺絲，且在固定木材或其他包層至底層木材支架中具有廣泛可 能之應用，且該頭部及用以驅動該螺絲之驅動器之設置可經修 改以適合特定應用。 雖然設想該詳細描述之螺絲主要用於固定至一底層木材結 構，但是該螺絲能夠經驅動進入底層金屬結構。所描述之該螺 絲之較佳實施例能夠經驅動進入具有最大厚度為5〇 mm之金 屬結構，然而可能使用該螺絲之一典型金屬厚度為2 4mm。 201144622 【圖式簡單說明】 現將以僅參閱附圖之實例來描述本發明之一實施例’其中： 第1圖為根據該較佳實施例之一種自攻木材螺絲之側視圖； 第2圖為以與第！圖之視圖成直角所視之側視圖；以及 第3圖為第2圖中標記B之螺紋區域之放大剖面詳圖。 【主要元件符號說明】 4 :刀刃 8_:螺絲頭 10 :無螺紋部分 2 :鑽削部分 6 :凹槽 8a :齒 冷：夾角201144622, OBJECTS OF THE INVENTION: FIELD OF THE INVENTION The present invention relates to a self-tapping screw for fixing wood (e.g., paving slabs) to underlying wood joists or other structures. [Prior Art] Generally, when fixing a thick wood board to a bottom wood structure, the method is to pre-drill the wood thick board and then use a conventional self-tapping wood screw (such as a type 17 screw) to lay the wood thick board. Fixed to the underlying structure. If the wood paving slab is not pre-drilled, a conventional self-tapping wood screw is applied directly to the slab, especially when the screw is near the edge of the wood, which may result in the slab being at a fixed point Cracking, the closer the screw is to the edge, the more the cracking tendency increases. Cracking can cause safety problems and it is often necessary to replace the paving slab if cracking occurs. SUMMARY OF THE INVENTION The present invention, in its preferred embodiment, provides a self-tapping wood screw that can be applied to the edge of the paving slab (or other wood) without prior drilling to avoid cracking. According to the present invention, there is provided a screw for fixing wood to a bottom wood or metal bracket, the screw comprising: a handle having a drilled portion at the end and a head at the other end, the drilled portion having a cutting edge with a cutting edge and one of the groove regions extending from the cutting edge, and a thread extending from the end of the drilling portion away from the drilling tip to a position spaced apart from the head, whereby the screw The handle has an unthreaded portion between the end of the thread 201144622 and the head, wherein the drilling portion is operated during the application of the screw to drill a hole having a diameter smaller than the unthreaded portion of the screw handle The large diameter, whereby when the screw is applied through the wood to be fixed, a through hole for one of the unthreaded screw shank portions is formed through the wood. In a preferred embodiment of the invention, the threaded tip diameter is at least substantially constant over one of its lengths and the diameter is at least about 0.75 mm greater than the diameter of the drilled portion. [Embodiment] The screw of the preferred embodiment of the present invention has a drilled portion 2 which is similar in shape to a drilled portion of a self-tapping screw designed for metal, that is, has two inclined and diametrically opposed cutting edges 4, The cutting edge 4 defines the drilling tip, the leading end leading to a diametrically opposed groove 6 extending along the length of the drilling portion. The threaded self-drilling portion 2 of the screw extends away from the end of the cutting edge 4 to a position away from the screw head 8 in the center so as to leave a threadless portion 10 of the screw shank between the end of the thread and the screw head. The thread shape provides a thread tip diameter that is constant over a substantial portion of the length of the thread, although it is understood that the thread is at least one and possibly two thread turns at the outer end of the thread (which is adjacent the end of the drilled portion 2) Gradually rise from zero to full thread height. In the illustrated embodiment, the screw head 8 is a countersunk head having teeth 8a on its underside to cut a taper on the surface of the wood, the head having an interior for receiving the drive drill driver. In practice, the length of the unthreaded portion 10 plus the depth of the head 8 will correspond to the thickness of the wood to be secured, which is typically produced in a standard thickness (or standard thickness range) for the 201144622 decking. One of the screws of the preferred embodiment is characterized in that the effective diameter of the drilling portion 2 is larger than the effective diameter of the unthreaded portion 10 of the screw shank so that when the screw is applied, the drilling portion 2 passes through it and will be fixed. The wood drilling is provided for the through hole of one of the unthreaded shank portions 1 , and when the g S Hai screw is fully applied, the unthreaded shank portion 1 〇 extends through the through hole. This is a recommended way to provide a through-hole for standard self-tapping screws when pre-drilling wood paving slabs. In fact, according to a preferred embodiment of the present invention, the wood screws may be produced in a size from 8 wire diameters to 14 wire diameters, and depending on the actual complexity of the screws, the diameter of the drill (four) points 2 exceeds the absence. The threaded shank portion 10 has a 0.25 mm to 1.5 mm. It is envisaged that most of the screws used to secure the wood paving slabs are 10-wire screws, and for these screws, the diameter of the drilled portion 2 exceeds the diameter of the unthreaded shank portion by about 6 mm to 〇 7 mm. As can be seen from Fig. 2, it is 90 in the view of Fig. 1. When viewing the drilled portion, in other words, when viewed from the side, the screw has a reduced depth relative to the depth visible on the drilled portion of a conventional self-tapping metal screw. This reduced depth is caused by the displacement of the material within the cylindrical wire blank during the formation of the oversized drilling portion 2 (in terms of its effective drilling diameter). Because the oversized drill 'minute 2 is also in the underlying wood structure _ used to drive the oversized hole of the screw', the thread must have a straight L enough to just mesh with the surrounding wood, which means that the screw has a slightly larger diameter than the same A conventional tip diameter of a threaded tip having a large diameter. The web is caused by the displacement of the material in the wire blank during the rolling process, and for a given wire diameter screw there is an inherent amount of material that can be displaced from the wire blank to form the thread. limit. In the preferred embodiment, the clip W is 15 by reducing the ventral angle of the thread to an angle of 201144622^. To 45. (preferably about) #目为为为在知知螺丝-like 60. The angle of the. The result of this reduction = ventral angle 'increased the material used to provide the desired enlarged thread tip'. Within the size range (the screw of the preferred embodiment of the invention may be manufactured in this size (8 wire diameter to 14 wire diameter)), the diameter of the threaded tip is beyond the diameter of the drill. The diameter of the P-knife 2 is at least about 75 faces, and more typically exceeds about _ to 1.4 mm. Due to the practical limitation of the displacement of the material used to form the thread, in the case of a degree of damage to the pitch or the thickness of the thread root, the diameter of the thread tip may not exceed the diameter of the drilled portion more than about within the above-mentioned wire diameter range. 2.0 face to 2.5_. In the example of a (7) wire diameter screw having 16τρι (turns per inch), the threaded tip of the screw of the preferred embodiment has a diameter of about 58 mm to 6 cm. However, in a conventional screw of the same wire diameter. The thread tip has a diameter of approximately 4.65 mm to 4.8 mm. In the illustrated embodiment, the head of the screw is a countersunk head having teeth on the underside of the countersunk to cut the surface of the wood paving slab - the pit dent σ should be understood as 'the broad sense of the present invention The screw is limited to the screws of the wood decking and has a wide range of applications in fixing wood or other cladding to the bottom timber bracket, and the head and the drive for driving the screw can be modified to Suitable for specific applications. Although the screws of the detailed description are primarily intended for attachment to an underlying wood structure, the screws can be driven into the underlying metal structure. The preferred embodiment of the screw described can be driven into a metal structure having a maximum thickness of 5 mm, although one of the screws may be used with a typical metal thickness of 24 mm. BRIEF DESCRIPTION OF THE DRAWINGS One embodiment of the present invention will now be described by way of example only with reference to the accompanying drawings in which: FIG. 1 is a side view of a self-tapping wood screw according to the preferred embodiment; For the first! The view of the figure is a side view as viewed at right angles; and Fig. 3 is a detailed enlarged view of the threaded area of the mark B in Fig. 2. [Main component symbol description] 4: Blade 8_: Screw head 10: Unthreaded part 2: Drilling part 6: Groove 8a: Teeth Cool: Angle